of winning 5 10 seat SNGs in a row is 1 in 100,000. Been a while since I played standard SNGs, but it will be quite a feat. Not sure if I ever won 3 in a row.
Note... assuming there are 2 or 3 bad players per SNGs and you are a good SNG player, your odds should be a bit better than 1 in 10 chance of winning each SNG... say 1 in 8 shot. Still 32768 to 1.
I pretty much only play double of nothing SNGs.... think I am on my best win streak yet. 9 in a row. Odde of winning 9 DONs in a row is 1 in 512.